ADD: optionality for second marker function
PEP8 and remove np.testing
ENH add averager to the kit class, add support for multiple markers within mrk
FIX remove average_mrks

RM unnecessary files
ADD test of >2 mrks
FIX read_raw_kit args, docstring
FIX arg order
Merge pull request #969 from t3on/tb-ENH-kit

ADD: optionality for second marker function